1. a Optimal Performance Ltd, Bedford House , 23 Richmond Hill, Clifton, Bristol, BS8 1BA, UK
2. b School of Sport, Performing Arts and Leisure, University of Wolverhampton , Wulfruna Street, Wolverhampton, WV1 1SB, UK
3. c PEd Research and Development Flt, DCAE Cosford , Wolverhampton, West Midlands, WV7 3NJ, UK